1766556061 has 2 divisors, whose sum is σ = 1766556062. Its totient is φ = 1766556060.

The previous prime is 1766556023. The next prime is 1766556089. The reversal of 1766556061 is 1606556671.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1347330436 + 419225625 = 36706^2 + 20475^2 .

It is an emirp because it is prime and its reverse (1606556671) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1766556061 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1766555999 and 1766556017.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1766554061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 883278030 + 883278031.

It is an arithmetic number, because the mean of its divisors is an integer number (883278031).

Almost surely, 2^1766556061 is an apocalyptic number.

It is an amenable number.

1766556061 is a deficient number, since it is larger than the sum of its proper divisors (1).

1766556061 is an equidigital number, since it uses as much as digits as its factorization.

1766556061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 226800, while the sum is 43.

The square root of 1766556061 is about 42030.4182824773. The cubic root of 1766556061 is about 1208.8594450154.

The spelling of 1766556061 in words is "one billion, seven hundred sixty-six million, five hundred fifty-six thousand, sixty-one".